Authorities imposed a midnight curfew for the second straight night in the tense St. Louis suburb where an unarmed black teen was shot dead last week by police.
Officials plan to decide on a day-by-day basis whether to extend the curfew, imposed Saturday night by Missouri Governor Jay Nixon in an effort to quell protests and looting, Missouri Highway Patrol spokesman Justin Wheetley said.
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After the heatwave come the storms, with lightning flashes illuminating the night sky across much of the country last night.
An Independence Day event at a UK base has been cancelled by the US Air Force over security fears.
British firms predict the economy should sustain a "solid" pace of growth for the rest of the year thanks to lower oil prices and inflation.